Advanced Materials Research Vols. 328-330

Abstract: In order to measure the individual flow rate of gas and liquid of wet gas two-phase flow without separation on line in situ.a computer system for metering wet gas based on labview has been developed. In this system, a high-performance embedded computer as the core unit has been used. Meanwhile, it consists of an industrial hard disk with wide temperature,a high precision data acquisition module, an industrial 12 inch LCD with wide temperature range, a group of rechargeable lithium battery and so on. The software platform is based on labview, which can achieve signal acquisition, calculate the gas and liquid transient flowrates, display and store data, etc. The application in industrial field shows that computer system developed here has good man-machine interaction interface, high reliability and other advantages.

Abstract: For improving assembly quality and automation of electric connectors, a solution of automatic assembly is discussed in this paper. With the machinery vision system, defects of the parts to be assembled can be real-time surveyed. By using the complex image recognition technology, the recognizing accuracy and reliability can be achieved. The designs of NC dividing head and smart positioning unit can make the process of transmission and assembly more perfect and effective. The optimal design of the mechanical structure has been made by virtual prototype technology. The designs of PLC control system and pneumatic system which are used in the automatic assembly machine have also been discussed. The control strategies of assembling process are quite challenges. The control profile of three stages has been used in the pressing assembly process, which can punch the parts assembled properly and smoothly without any surface damage. Also the application shows that the design is effective.

Abstract: In this paper, in order to solve the problem of PC-based CNC system, such as instability high cost, large volume so and on , an embedded motion controller based on S3C2440 system bus is designed by using S3C2440 microprocessor and PCL6045B special DSP chip. Hardware interface circuit and address mapping between ARM and PCL6045B are introduced in detail, and some interface functions of the motion controller base on multi-tasking Linux operating system is designed. At last, the driver development and driver debugging of PCL6045B motion control chip under Linux are focused on. The result indicates that this controller can not only improve the real-time performance and reliability of system under the support of Linux, but also reduce the cost greatly.

Abstract: In order to measure the gas and liquid flow rates of the wet gas on line not separation, this paper develops a wet natural gas two-phase computation system, which accompanies with the dual throttling wet gas flow meter as a secondary instrument. This flow computation system is based on ARM9 embedded system with the Linux OS and is powered by a solar power system. A hardware and software platform of a secondary instrument working for the flow rates computation is constructed for unattended operational natural gas wells. The signal acquisitions of the pressure, differential pressure, temperature, and the calculation of two phase metering model have been actualized. In addition to the basic function, the system provides display, storage, and historical data inquiry of the instantaneous and accumulative flow rates, as well as the GPRS wireless communication. It has already been trial run at some unattended operational wellheads for the gas and liquid metering of the wet gas.

Abstract: In order to improve the level of intensive factory aquaculture, an intelligent monitoring system with PROFIBUS-DP network is designed. The main parameters of the culture environment and their control methods are discussed. The human-machine interface and database are developed to achieve real-time acquisition, monitoring and process of culture data. A disease diagnosis system combining with case-based reasoning and fuzzy logic is designed, which provides great convenience for the users and improves the quality of aquaculture.

Abstract: Traditional methods regard coverage area of radar network as the union of every radar’s coverage area. Aiming at this issue, the relationship among radar detection range, radar cross section, signal-to-noise ratio, detection probability and false alarm probability is analyzed. Detection probability model for single radar is established. Calculation method of detection probability for radar network is also researched. Coverage area of radar network can be obtained according to the detection probability. Simulation results show coverage area of radar network is not simply the union of every radar’s coverage area and it is decided by the detection probability. Research of this paper provides a theoretical base of detecting, tracking and placement for radar network.

Abstract: In order to investigate the failure mechanism of water-lubricated rubber bearings based on the method of time domain and frequency range of vibration signals, the characteristic performance is analyzed when there is failure and it is found that the abnormal vibration has relations with the contact pressure and the negative curve of speed-friction coefficient. Furthermore, some failure forms are quoted and applied to analyze the fault diagnosis of the rubber bearings. At a certain speed range and specific pressure, when the contact pressure is larger and the friction coefficient is higher, the vibration will be more obvious. Moreover, there are some preventive measures to avoid or eliminate potential hidden troubles.

Abstract: The application of mechatronics technology is introduced in the field of the national economic sectors. The traditional methods of deastringency in fresh persimmon are presented. And production process, quality identification, quality control and heat preservation method of using warm water for fresh persimmon deastringency are also introduced. The device of fresh persimmon deastringency of using warm water was designed and the electromechanical integration system structure and working principle were explained. Meanwhile, the system of control flow diagram was given and the problem of temperature control was focused on. Finally, the superiority of the system compared with traditional methods was summarized.

Abstract: Wireless sensor networks more complex in the marine environment than in terrestrial environments, the independent positioning mechanism can reduce the difficulty of modeling. The study on underwater acoustic sensor network node distribution of two-dimensional and three-dimensional respectively and the establishment relation function of the distance of beacon nodes and unknown nodes which based on in the traditional centroid algorithm idea. Using Taylor series can reduce the complexity computing of nodes who sensitive to energy because of its linear approximation in a manner. Because the genetic algorithm fitness function only interested in building the corresponding function, optimizing the established function. Simulation results show that: it can achieve the nodes self-localization effectively both in two- dimension and three-dimension that the distance formulas between nodes are liberalized by Taylor series and optimized by genetic algorithms.

Abstract: The pattern of using the household billing to promote heating energy savings has become a focus discussion in the current national energy conservation. The key factor for following such way is to find a reasonable heat meter. To the national standard CJ128-2007, the length of the heat meter body is limited to 130/190 mm, compared with the actual diameter of the tube is 18 mm(standard20), the measuring of the small flux by ultrasonic is to some extend difficult. In this paper, we report a research of a two reflection structure flow meter. By a procedure of twice reflection, the effective distance of the spreading of the ultrasonic signal is longer than some other usual structures. So it can work in above conditions. The flow meter has been carried on the online testing in a district of Beijing since 2009.